KR0117856Y1 - Power control circuit of satellite broadcasting receiver - Google Patents

Abstract

This invention relates to a power supply control circuit of a satellite broadcasting receiver. The present invention provides a satellite antenna, a satellite broadcasting tuning and demodulation unit, and a first antenna to keep the power off until the scheduled recording time when the scheduled recording function is performed, and to automatically turn on the power when the scheduled recording time comes. Audio / video signal processing unit, satellite receiver input / output terminal, first microcomputer, power supply unit, video cassette recorder input / output terminal, third switch, second audio / video signal processing unit, video head, And a second microcomputer. Therefore, when the scheduled recording time comes, the power unit is operated by the control of the second microcomputer to perform the scheduled recording of satellite broadcasting, and when the scheduled recording ends, the power unit is cut off by the control of the second microcomputer and the satellite receiver is turned off. Can eliminate the waste of power. The power supply control circuit of the satellite broadcasting receiver can be used for general home satellite receivers and video cassette recorders.

Description

Power Control Circuit of Satellite Broadcasting Receiver

1 is a block diagram showing an embodiment of a power supply control circuit of a satellite broadcasting receiver according to the present invention;

2 is a block diagram showing another embodiment of a power supply control circuit of a satellite broadcasting receiver according to the present invention;

3 is a partial detailed circuit diagram of FIG.

Explanation of symbols for main parts of the drawings

10: satellite antenna 20: high frequency receiving antenna

30: satellite receiver 31: satellite broadcasting tuning and demodulation unit

32: first audio / video signal processor

33: first microcomputer 34: power supply

35: second switch 36: satellite receiver input / output terminal

40: video cassette recorder

41: Video cassette recorder input / output terminal

42: third switch

43: second audio / video signal processor

44: second microcomputer 45: video head

50: TV51: tuning and demodulation

52: first switch 53: video signal processing unit

54 cathode ray tube A: switching unit

D1, D2: Diode Q1 ~ Q9: Transistor

R1 ~ R3: Resistance VCC: Constant voltage source

N1 ~ N3: Node

The present invention relates to a power supply control circuit of a satellite broadcasting receiver, and more particularly, to a power supply control circuit of a satellite broadcasting receiver that controls the power supply of the satellite broadcasting receiver when performing a scheduled recording of a video cassette recorder (hereinafter referred to as a VCR). It is about.

Since satellite broadcasting has been started, by recording and watching satellite broadcasts, the configuration of the peripheral devices connected to the VCR has become very complicated.

Since satellite broadcasting has been started, the spread of satellite broadcasting receivers has increased, and satellite receivers and VCRs are kept powered off until the time reserved by the user.

However, when receiving satellite broadcasts, since the satellite broadcast receiver itself does not have a reservation recording function, the satellite broadcasting had to be kept on in order to reserve recording. In other words, after the power of the satellite broadcasting receiver is turned on, the reservation recording time is set by using the reservation recording function configured in the VCR.

Therefore, the VCR is kept off until the reserved recording time, but the power of the satellite broadcast receiver remains on, thereby causing a waste of power.

The present invention is to solve the above problems, the object of the present invention is to maintain the power off state before the scheduled recording time when performing the scheduled recording function, the power is automatically turned on when the scheduled recording time The present invention provides a broadcast receiver power supply control circuit.

In order to achieve the above object, in the apparatus for pre-recording the broadcast signal received by the satellite radio receiver in the VCR, the power control circuit of the satellite radio receiver including a satellite receiver power supply unit, a switch, a VCR microcomputer and a switching unit is provided. do.

The satellite receiver power supply supplies the power required to operate components inside the satellite receiver. The switch outputs a predetermined first high voltage at the start of the VCR reserved recording, and outputs a predetermined first low voltage at the end of the reserved recording. The VCR microcomputer outputs a second high voltage for turning on the VCR power and turning on the power of the satellite receiver power supply when the reserved recording program is input and at the scheduled time, and turns off the VCR power when the reserved recording ends. A second low voltage for turning off the power of the receiver power supply unit is output. The switching unit receives the first high voltage and the first low voltage output from the switch as a control signal, respectively, and supplies the second high voltage and the second low voltage output from the VCR microcomputer to the satellite receiver power supply unit, respectively. The switching unit includes a first transistor and a second transistor. The first transistor is turned on by receiving the first high voltage output from the switch at the base end. The second transistor supplies a second high voltage output from the VCR microcomputer to the power supply unit by turning on the first transistor.

Hereinafter, a preferred embodiment of the satellite broadcasting receiver power control circuit according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram showing an embodiment of a satellite broadcasting receiver power supply control circuit according to the present invention. The video cassette recorder 40 in the case of not recording and watching the satellite broadcast received by the satellite receiver 30 is responsible for connecting the satellite receiver 30 and the television 50 to each other, thereby the satellite receiver 30 and the television set. Since the configuration of the video cassette recorder 40 is omitted, only the satellite receiver 30 and the television 50 are shown.

1, the satellite antenna 10 and the high frequency reception antenna 20 are connected to the satellite receiver 30, respectively, and the satellite receiver 30 is connected to the television 50. As shown in FIG.

Meanwhile, the general broadcast signal input through the high frequency reception antenna 20 is applied to the tuning and demodulation unit 51 configured in the television 50 through the satellite receiver 30 and demodulated, and then demodulated to the first switch 52. Applied signal.

Here, the first switch 52 is a switch for selecting a broadcast signal that the user wants to watch. The broadcast signal selected through the first switch 52 is applied to the video signal processing unit 53 and signal processed, and then applied to the cathode ray tube 54 and displayed on the screen.

2 is a block diagram showing another embodiment of the satellite broadcasting receiver power supply control circuit according to the present invention. In FIG. 2, the same components as those of the first figure use the same reference numerals.

2, the satellite antenna 10 and the high frequency reception antenna 20 are respectively connected to the satellite receiver 30, the satellite receiver 30 is connected to the video cassette recorder 40, the video cassette recorder 40 is connected to a television 50.

Referring to the configuration described above, the operation of the satellite broadcast signal input through the satellite antenna 10 is applied to the satellite receiver 30 after the demodulation process, the video signal and audio signal video cassette recorder ( 40).

In addition, the general broadcast signal input through the high frequency reception antenna 20 is applied to the video cassette recorder 40 to select satellite broadcast and general broadcast under the control of the video cassette recorder 40, and to the rear television 50. Is authorized. The television 50 receives a signal and displays it on the screen.

3 is a detailed circuit diagram of FIG. In FIG. 3, the same parts as those of the second drawing have the same reference numerals.

Referring to the configuration of the satellite receiver 30 during the third period, the satellite antenna 10 is connected to the satellite broadcasting tuning and demodulation unit 31 in the satellite receiver 30, and the satellite broadcasting tuning and demodulation unit 31 is formed. 1 is connected to the audio / video signal processor 32, and the first audio / video signal processor 32 is connected to the power supply 34 and the satellite receiver input / output terminal 36, respectively.

In addition, the first microcomputer 33 is connected to the power supply unit 34 through the diode D1, and the power supply unit 34 is connected to return to the first microcomputer 33 again.

Further, a branch between the first microcomputer 33 and the diode D1 is connected to the emitter of the transistor Q5 configured in the switching unit A, and the collector of the transistor Q5 is connected to the other transistor Q6. It is connected to the base, and the base of transistor Q5 is connected to the collector of another transistor Q5.

In addition, the emitter of the transistor Q4 is grounded and connected to the node N1 through the base of the transistor Q4 and the resistor R2. In addition, it is separated between the base of transistor Q4 and resistor R2 and connected to the collector of transistor Q3, the emitter of transistor Q3 is grounded, and the base of transistor Q3 is node N2. Is connected to.

In addition, the power supply 34 is connected to the emitter of the transistor Q7, the collector of the transistor Q7 is connected to the node N3, branched from the node N3, one of the satellite receiver input / output terminals And the other is connected to the emitter of transistor Q2. The base of transistor Q7 is connected to the collector of another transistor Q6, and the emitter of transistor Q6 is grounded.

In addition, the collector of the transistor Q2 is connected between the diode D1 and the power supply unit 34 through the diode D1, and the base of the transistor Q2 is connected to the collector of the other transistor Q1. As for the base of Q1, the television terminal in the second switch 35 is grounded.

On the other hand, when the configuration of the VCR 40, one side of the video cassette recorder input / output terminal 41 is connected to the satellite receiver input / output terminal 36 configured in the satellite receiver 30, the other side is a third switch The third switch 42 is connected to the second audio / video signal processor 43. In addition, the second microcomputer 44 is connected, one side of the second microcomputer 44 is connected to control the third switch 42, and the other side is connected to the base of the transistor Q9.

In addition, the emitter of transistor Q9 is grounded, the collector of transistor Q9 is connected to the base of another transistor Q8, the emitter of transistor Q8 is connected to constant voltage source VCC, and the transistor The collector of Q8 is connected to the video cassette recorder input / output terminal 41 through a resistor R3.

The operation state will be described with reference to the circuit as described above. First, the case where the satellite receiver 30 is connected to the television will be described.

When the power of the receiver 30 is turned on to receive the satellite broadcast, the first microcomputer 33 outputs a high signal to the power supply unit 34, and the power supply unit 34 receiving the control signal is located in the satellite receiver 30. Power the entire system. The satellite broadcasting tuning and demodulation unit 31 and the first audio / video signal processor 32 receiving a predetermined voltage from the power supply unit 34 process the satellite broadcasting received from the satellite antenna 10. The first microcomputer 33 also outputs a high signal to the emitter of the transistor Q5.

On the other hand, since the satellite receiver 30 is connected to the television 50, the second switch 35 selects the main terminal and the television terminal to be connected.

Accordingly, the two transistors Q1 and Q3 are turned off, and a constant voltage applied from the power supply unit 34 is applied to the base of the transistor Q4 through the resistor R2 so that the transistor Q4 is turned on. . When the transistor Q4 is turned on, the transistor Q5 is turned on so that a high signal applied from the first microcomputer 33 is applied to the base of the transistor Q6.

Accordingly, the two transistors Q6 and Q7 are turned on, and a constant voltage generated from the power supply unit 34 is applied to the satellite receiver input / output terminal 36 through the transistor Q7 and the resistor R1, thereby satellite broadcasting. You can watch it.

Next, a case where the satellite receiver and the VCC 40 are connected and used will be described.

When the satellite receiver 30 and the VCC 40 are connected, the third switch 42 configured in the VCR 40 is connected to a satellite broadcasting dedicated terminal, that is, an AV2 terminal. In addition, since the satellite receiver 30 and the VCR 40 are connected, the second switch 35 in the satellite receiver 30 is selected such that the main terminal and the television terminal are connected.

When the user wants to pre-record the satellite broadcast, the second microcomputer 44 in the VCR 40 turns on the power of the VCR and simultaneously outputs a high signal to the base of the transistor Q9.

When transistor Q9 is turned on, transistor Q8 is turned on, and a constant voltage applied from constant voltage source VCC connected to the emitter of transistor Q8 is applied to transistor Q8 and resistor R3. It is applied to the video cassette recorder input / output terminal 41 through. This output is applied to the collector of transistor Q7 and the emitter of transistor Q2 via resistor R1.

At this time, since the main switch and the VCR terminal are connected to the second switch 35, a constant voltage applied from the power supply unit 34 is applied to the bases of the two transistors Q1 and Q3 to provide two transistors Q1 and Q3. Is turned on. Transistor Q2 is turned on and a constant voltage applied from constant voltage source VCR in VCR 40 is applied to power supply 34 through transistor Q2 and diode D2.

The power supply unit 34 that receives a predetermined voltage supplies power to operate the satellite receiver 30. In addition, when the transistor Q3 is turned on, the transistors Q6 and Q7 are not operated because the two transistors Q4 and Q5 are turned off.

On the other hand, when the scheduled recording is finished, the second microcomputer 44 in the VCR 40 outputs a low signal to turn off the power supply 34 in the satellite receiver 30 for the above operation sequence.

As described above, according to the power control circuit of the satellite broadcasting receiver according to the present invention, when the scheduled recording function is performed, the power is kept off until the scheduled recording time and the power is automatically turned on when the scheduled time comes. Can eliminate the loss.

Claims (2)

An apparatus for reservation recording of a broadcast signal received at a satellite broadcasting receiver to a VCR, A satellite receiver power supply for supplying power for operating components inside the satellite receiver; A switch for outputting a predetermined first high voltage at the start of a VCR reserved recording and outputting a predetermined first low voltage at the end of the reserved recording; When the reserved recording program is input and the scheduled time comes, the second high voltage for turning on the VCR power and turning on the satellite receiver power supply unit and outputting the second high voltage at the end of the scheduled recording, and simultaneously turning off the VCR power supply and the satellite receiver power supply unit A VCR microcomputer for outputting a second low voltage for turning off a power supply; And And a switching unit configured to receive a first high voltage and a first low voltage output from the switch as a control signal, respectively, and supply a second high voltage and a second low voltage output from the VCR microcomputer to the satellite receiver power supply. A power control circuit for a satellite broadcasting receiver. The method of claim 1, wherein the switching unit A first transistor which is turned on by receiving a first high voltage output from the switch at a base end; And a second transistor supplying a second high voltage output from the VCR microcomputer to the power supply unit by turning on the first transistor.